Design for security box



FIG. 1 is a top plan view of a security box showing my new design;

FIG. 2 is a bottom plan view of the security box of FIG. 1;

FIG. 3 is a front elevation of the security box as viewed from the bottom in FIG. 1;

FIG. 4 is a rear elevation of the security box as viewed from the top in FIG. 1;

FIG. 5 is an end elevation as viewed from the left in FIG. 1; and,

FIG. 6 is an end elevation as viewed from the right in FIG. 1. 

The ornamental design for security box, as shown and described. 